<center> <form name="menu1" method="POST" ACTION="URI">
<p><select name="mymenu">
<option value="//www.smileyhelper.com/tutdropdownmenus.php#">-ข้อความ</option>
<option value="//www.smileyhelper.com/tutdropdownmenus.php#">ข้อความ</option>
<option value="//www.smileyhelper.com/tutdropdownmenus.php#">ข้อความ! </option>
</select>
<input type="button" onClick="location =
document.menu1.mymenu.options
[document.menu1.mymenu.selectedIndex].value;" value="Go"> </p>
</form> </center>

<center> <form name="menu2" method="POST" ACTION="URI">
<p style="margin-top: 0; margin-bottom: 0"><select name="mymenu">
<option value="//www.smileyhelper.com/tutdropdownmenus.php#" style="background-color:pink;">ข้อความ</option>
<option value="//www.smileyhelper.com/tutdropdownmenus.php#" style="background-color:yellow;">ข้อความ</option>
<option value="//www.smileyhelper.com/tutdropdownmenus.php#" style="background-color:purple;">ข้อความ! </option>
</select>
<input type="button" onClick="location =
document.menu2.mymenu.options
[document.menu2.mymenu.selectedIndex].value;" value="Go"> </p>
</form> </center>

<center> <form name="menu3" method="POST" ACTION="URI">
<p><select name="mymenu">
<option value="//www.smileyhelper.com/tutdropdownmenus.php#">-ข้อความ</option>
<option value="0"></option>
<option value="//www.smileyhelper.com/tutdropdownmenus.php#">ข้อความ</option>
<option value="//www.smileyhelper.com/tutdropdownmenus.php#">ข้อความ! </option>
</select>
<input type="button" onClick="location =
document.menu3.mymenu.options
[document.menu3.mymenu.selectedIndex].value;" value="Go"> </p>
</form> </center>